Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Accounts Receivable, Allowance for Credit Loss, Current	$ 65	$ 65
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Shares Issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.00001	$ 0.00001
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000
Common Stock, Shares, Outstanding (in shares)	44,027,121	37,211,071
Common Stock, Shares, Issued (in shares)	44,027,121	37,211,071
Common stock, $0.00001 par value; 100,000,000 shares authorized; 44,027,121 and 37,211,071 shares issued and outstanding, respectively	$ 0	$ 0